Table 1.
Differences between reverse field and the PIDVFs for registrations performed on the eight prostate image sets (I0,I1,…,I7). For the B-Spline DVFs, the reverse field is generated by running the DIR algorithm with reference and study images exchanged. SICLE autogenerates the reverse field. No points had inverse computing errors greater than 0.01 cm for these PIDVFs. The number of nonpositive Jacobians for the DVFs is also listed for each registration.
| R and S | B-Spline DVF | SICLE DVFs | ||||
|---|---|---|---|---|---|---|
| No. of nonpositive Jacobians | Maximum difference (cm) | Average difference (cm) | No. of nonpositive Jacobians | Maximum difference (cm) | Average difference (cm) | |
| I0 and I1 | 103 | 2.69 | 0.053 | 0 | 0.74 | 0.0068 |
| I0 and I2 | 52 | 1.14 | 0.044 | 0 | 0.87 | 0.0069 |
| I0 and I3 | 23 | 1.14 | 0.032 | 0 | 0.45 | 0.0075 |
| I0 and I4 | 9 | 1.17 | 0.034 | 0 | 0.27 | 0.0081 |
| I0 and I5 | 8 | 0.77 | 0.029 | 0 | 0.039 | 0.0022 |
| I0 and I6 | 201 | 0.81 | 0.037 | 0 | 0.076 | 0.0082 |
| I0 and I7 | 8 | 0.97 | 0.026 | 0 | 0.591 | 0.0052 |